On Earth in the 22nd century, Daleks have enslaved the planet, and humans live in fear of their masters. Meanwhile, back in the 20th century, a peace conference is urgently needed to prevent World War Three. When reports reach UNIT of a ghost at Auderly House -- the site for the conference -- the Doctor and Jo decide to investigate. Danger is waiting for them there, including a trip two hundred years into the future without the TARDIS.